A power storage mechanism for a nail gun and a nail gun

Abstract

The application belongs to the technical field of fastening devices and relates to a force storage mechanism for a nail gun and the nail gun. The force storage mechanism for the nail gun comprises a cylinder body, a movable seat, a spring unit, a piston and a striker, and the cylinder body has a spring cavity and a gas cavity inside; the spring unit is movably installed in the spring cavity and has at least one energy storage spring; the piston is movably arranged at the front end of the cylinder body; wherein the spring cavity has a first spring cavity and a second spring cavity, the gas cavity is located between the first spring cavity and the second spring cavity, and the spring unit is arranged in the first spring cavity and the second spring cavity; when the piston is pushed by external force towards the direction of the movable seat, the gas in the gas cavity and the spring unit in the spring cavity are compressed to store force. The spring cavity is provided with two spring cavities, which can store double elastic force, and the gas cavity is arranged between the two spring cavities, which can absorb the reaction force of the spring unit and better protect the overall structure.

Description

Technical Field

[0001] This invention belongs to the field of fastening device technology, and relates to a power storage mechanism for a nail gun and a nail gun. Background Technology

[0002] A nail gun is a fastening tool, widely used in construction. Based on the power source, nail guns are generally classified into lithium-ion nail guns and pneumatic nail guns. Lithium-ion nail guns use a lithium battery to provide power, controlling a drive motor and corresponding transmission structure to push a piston. The piston compresses a force spring to store energy. When firing a nail, the force spring drives the piston, which in turn moves a firing pin mounted on the piston to strike and eject the nail. For example, the principle of a spring-driven lithium-ion nail gun disclosed in Chinese Utility Model Patent No. 201921395877.X is as follows: the drive motor moves the nail-driving component away from the nail-driving direction via a drive wheel, thereby compressing the drive spring. Then, the drive wheel disengages from the nail-driving component, and the nail-driving component is ejected at high speed under the action of the drive spring, thus firing the nail. This spring-loaded lithium-ion nail gun is small and portable, but it is mainly suitable for low-power nail shooting scenarios and cannot meet the needs of high-power nail shooting. In addition, after nailing, the drive spring will continuously bounce back and forth in the cylinder, causing a continuous vibration phenomenon on the nail gun. If the spring force is greater, the reaction force of the drive spring on the nail gun will be greater, the vibration phenomenon will be more obvious and longer, and the user will need to exert more grip force to control the nail gun, which can easily lead to fatigue.

[0003] Pneumatic nail guns, as described in the prior patent CN214560685U, have a cylinder inside the gun housing. Inside the cylinder is a piston, which divides the cylinder's interior into an inlet chamber and an outlet chamber. The inlet chamber requires a separate air compressor for air supply. The compressor fills the inlet chamber with high-pressure gas, pushing the piston and causing a firing pin mounted on the piston to strike and eject the nail. However, this type of nail gun, which uses a spring to store energy and drive the nail, is not suitable for objects with high hardness due to the limitations of spring force. Furthermore, the need for a separate air compressor makes it inconvenient to carry. To address these shortcomings, lithium-ion battery-powered nail guns have emerged. These guns have a pre-existing air chamber inside the gun, which is filled with a certain amount of gas. A lithium battery drives a motor to compress the gas in the chamber, creating the pressure needed to eject the nail. Although this type of lithium-ion electric nail gun is more convenient to use than the pneumatic nail gun mentioned above, as it does not require a separate air compressor, it still has some problems. For example, since the air compression ratio inside the cylinder is constant, a larger cylinder cavity is needed to store more gas in order to achieve higher power. This results in a larger size and heavier weight for the gas spring lithium-ion nail gun. At the same time, since the gas inside the cylinder needs to be repeatedly compressed, airtightness is crucial. The higher the power of the nail gun, the more difficult the manufacturing process becomes, which can easily lead to a higher scrap rate.

[0004] Therefore, there is an urgent need to design a nail gun that is compact, powerful, simple in structure, and easy to manufacture. Summary of the Invention

[0005] To solve the above problems, a power-accumulating mechanism for a nail gun and a nail gun are provided.

[0006] The present invention adopts the following technical solution:

[0007] A power storage mechanism for a nail gun, installed inside the nail gun, is used to provide power for the nail to be driven out of the nail gun. It comprises: a cylinder body disposed inside the nail gun, having a spring cavity and an air cavity inside; a movable seat movably disposed inside the cylinder body; a spring unit movably disposed inside the spring cavity and having at least one energy storage spring; a piston movably disposed at the front end of the cylinder body; and a firing pin mounted on the piston, with its front end extending out of the cylinder body for striking the nail. The spring cavity has a first spring cavity and a second spring cavity, and the air cavity is located between the first and second spring cavities. Both the first and second spring cavities contain spring units. When the piston is pushed by an external force towards the movable seat, the gas in the air cavity and the spring unit in the spring cavity are compressed to store power.

[0008] The charging mechanism for a nail gun provided by the present invention may also have the following technical feature: a gap is provided between the outer periphery of the piston and the inner wall of the first spring cavity for connecting the spring cavity with the outside.

[0009] The charging mechanism for a nail gun provided by the present invention may also have the following technical feature: a piston sealing ring is provided between the outer periphery of the piston and the inner wall of the first spring cavity to isolate the spring cavity from the outside.

[0010] The power storage mechanism for a nail gun provided by the present invention may also have the following technical features: a front cover and a rear cover are respectively provided at the front end and the rear end of the cylinder, a buffer pad is provided between the front cover and the piston, and a sealing ring is provided between the rear cover and the inner wall of the cylinder.

[0011] The movable seat has a first movable seat and a second movable seat. A first spring cavity is formed between the first movable seat and the piston, an air cavity is formed between the first movable seat and the second movable seat, and a second spring cavity is formed between the second movable seat and the rear end cover.

[0012] The charging mechanism for a nail gun provided by the present invention may also have the following technical feature: a through hole is provided on the rear end cover to connect the second spring cavity with the outside.

[0013] The charging mechanism for a nail gun provided by the present invention may also have the following technical features: an air supply channel is provided on one side of the through hole, and an air valve is provided in the air supply channel. The air valve includes: a one-way valve core, which is movably disposed in the air supply channel; a one-way sealing ring, which is disposed between the through hole and the one-way valve core; a spring seat, which is disposed at the air outlet end of the air supply channel; and a one-way spring, one end of which is mounted on the spring seat and the other end of which cooperates with the one-way valve core. The one-way spring presses the one-way valve core against the one-way sealing ring to seal the through hole.

[0014] The charging mechanism for a nail gun provided by the present invention may also have the following technical features, wherein the spring unit includes at least one inner spring and an outer spring that sleeves the at least one inner spring inside, and a buffer pad for cushioning the piston is installed on the front side of the cylinder.

[0015] The charging mechanism for a nail gun provided by the present invention may also have the following technical features: the spring unit includes an inner spring and an outer spring arranged coaxially, the outer spring having a helical direction opposite to that of the inner spring; or, the spring unit includes two or more inner springs of different diameters and an outer spring, the inner springs being arranged coaxially with the outer springs inside the outer springs, and the helical directions of adjacent inner springs being opposite.

[0016] The present invention also proposes a nail gun, characterized by comprising: a power storage mechanism for providing power for the nail inside the nail gun to be driven out, and a drive mechanism for driving the power storage mechanism to generate power, wherein the power storage mechanism is the power storage mechanism and nail gun described above.

[0017] Invention Function and Effect

[0018] According to the nail gun power storage mechanism and nail gun of the present invention, a movable seat inside the cylinder divides the internal cavity of the cylinder into a spring cavity and an air cavity. Two spring cavities are provided, and the air cavity is located between the two spring cavities. A spring unit is installed in the spring cavity, and gas is contained in the air cavity. During the operation of the nail gun, the spring unit in the spring cavity and the gas in the air cavity are compressed, thereby generating the pressure of the compressed gas and the elastic force of the compressed spring. These two forces can be superimposed to provide power for nailing. Compared with single-type spring nail guns or single-type gas spring nail guns under the same conditions, it can increase power without increasing the manufacturing difficulty of the cylinder. Furthermore, providing two spring cavities allows for double the elastic force storage, and placing the air cavity between the two spring cavities can absorb the reaction force of the spring unit, better protecting the overall structure. In addition, separating the air cavity and spring cavity allows for their combined action while avoiding mutual interference to a certain extent. Moreover, during long-term use, wear in a certain area can be partially repaired and replaced, which is very convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the nail gun in Embodiment 1 of the present invention.

[0020] Figure 2 This is one of the cross-sectional views of the energy storage mechanism in Embodiment 1 of the present invention.

[0021] Figure 3 This is a second cross-sectional view of the energy storage mechanism in Embodiment 1 of the present invention.

[0022] Figure 4 This is a schematic diagram of the installation structure of the piston and the firing pin in Embodiment 1 of the present invention.

[0023] Figure 5 This is a schematic diagram of the piston mounting structure in Embodiment 2 of the present invention.

[0024] Figure 6 This is a cross-sectional view of the second spring cavity in Embodiment 3 of the present invention.

[0025] Figure 7 This is a schematic diagram of the air valve installation structure in Embodiment 4 of the present invention.

[0026] Figure 8This is a schematic diagram of the spring unit in Embodiment 5 of the present invention.

[0027] Figure 9 This is a schematic diagram of the spring unit in Embodiment 6 of the present invention.

[0028] Reference numerals: 10, accumulator mechanism; 11, striking assembly; 12, energy storage assembly; 13, cylinder; 131a, first spring chamber; 131b, second spring chamber; 1311, gap; 132, air chamber; 133, front cover; 134, rear cover; 1341, rear sealing ring; 1342, air supply channel; 1343, vent hole; 14a, first movable seat; 14b, second movable seat; 141, guide ring; 142, sealing ring; 143, spring mounting protrusion; 151, inner spring; 152, outer spring; 16, piston; front mounting. Part 161, Rear Mounting Part 162, Piston Seal Ring 163, Spring Mounting Groove 164, Radial Pin 165, Guide Ring 166, Firing Pin 17, Nail End 171, Mounting End 172, Buffer Pad 18, Through Hole 181, Air Valve 19, One-Way Valve Core 191, One-Way Spring 192, Spring Seat 193, One-Way Seal Ring 194, Drive Mechanism 20, Notched Gear 21, Tooth Part 211, Notched Part 212, Reducer 22, Drive Motor 23, Nozzle Mechanism 30, Nail Feeding Mechanism 40. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of the present invention easy to understand, the following describes the driving device for nail guns of the present invention in detail with reference to embodiments and accompanying drawings.

[0030] <Example 1>

[0031] This embodiment provides a nail gun with a charging mechanism, which makes it easier to operate and improves safety and nailing effect.

[0032] Figure 1 This is a schematic diagram of the nail gun in Embodiment 1 of the present invention.

[0033] like Figure 1 As shown, the nail gun includes a power storage mechanism 10, a drive mechanism 20, a nozzle mechanism 30, a nail feeding mechanism 40, a lithium battery module, and a housing (not shown in the figure).

[0034] The nozzle mechanism 30 has a firing channel and an outlet for firing nails; the nail feeding mechanism 40 has a nail passage in which a nail is installed, and the firing channel is connected to the nail passage; the rear end of the nozzle mechanism 30 is provided with a power storage mechanism 10 for driving the nail, and one side of the power storage mechanism 10 is connected to a drive mechanism 20 for driving its stored energy. The power storage mechanism 10 can provide the power for the nail in the nail gun to be fired. The power storage mechanism 10 and the drive mechanism 20 are covered by a shell, and a handle extends from the rear of the shell. A lithium battery module for replenishing energy to the drive mechanism 20 is installed at the lower end of the handle, and a nail firing switch for controlling the drive mechanism 20 is provided at the upper end of the handle.

[0035] Figure 2 This is one of the cross-sectional views of the energy storage mechanism in Embodiment 1 of the present invention.

[0036] Figure 3 This is a second cross-sectional view of the energy storage mechanism in Embodiment 1 of the present invention.

[0037] like Figure 2 and Figure 3 As shown, the energy storage mechanism 10 includes a striking component 11 and an energy storage component 12. The striking component 11 is used to strike the nail, and the energy storage component 12 cooperates with the striking component to drive the striking component to perform linear motion. The energy storage component 12 has a cylinder 13, a movable seat, and a spring unit. The cylinder 13 is made of metal and is housed within the casing of the nail gun. The cylinder 13 has a front side, a rear side, and a cylinder body connecting the two. The front side and rear side can be integrally formed at the front and rear ends of the cylinder body, or they can be separately disposed at the front and rear ends of the cylinder body. In this embodiment, as... Figure 2 As shown, the front part is a front end cover 133, which is integrally formed by welding at the front end of the cylinder body. A nozzle mechanism 30 is installed on the front end. The rear part is a rear end cover 134, which is installed at the rear end of the cylinder body by a rear sealing ring 1341 and the two are fixed together by four fastening screws. The interior of the cylinder body has a cavity for installing a movable seat and a spring unit. The front end cover 133 and the rear end cover 134 are respectively installed at the front and rear ends of the cavity. The movable seat is movably disposed in the cylinder body 13 and divides the cavity into a spring cavity and an air cavity 132. The spring unit is movably installed in the spring cavity and has at least one energy storage spring 15.

[0038] The striking assembly 11 includes a piston 16, a firing pin 17, and a buffer pad 18. The piston 16 is movably disposed at the front end of the cylinder 13, i.e., at the front end of the cavity. The rear end of the firing pin 17 is fixedly mounted on the piston 16, and its front end extends out of the cylinder 13 to strike the nail. The buffer pad 18 is located at the front end of the cylinder 13 and fits against the front end cover 133. Specifically, the piston 16 includes a front mounting portion 161 for mounting the firing pin 17 and a rear mounting portion 162 for mounting the energy storage spring 15. The firing pin 17 has a nail-firing end 171 extending out of the buffer pad 18 and the front end cover 133 for firing the nail, and a mounting end 172 mounted on the piston 16. Figure 2 As shown, a through hole 181 is provided in the middle of the buffer pad 18, and correspondingly, an opening is provided in the middle of the front cover 133 to allow the nail end 171 of the firing pin 17 to extend out. The width of the front mounting part 161 is smaller than the width of the rear mounting part 162, and the front mounting part 161 can extend into the through hole of the buffer pad 18. The area of ​​the rear mounting part 162 protruding from the front mounting part 161 can contact the buffer pad 18, thereby effectively buffering the piston 16 and limiting the piston 16 to prevent it from dislodging from the cavity. When the firing pin 17 and the piston 16 are pushed towards the spring unit by the external force brought by the drive mechanism 20, the gas in the air chamber 132 and the energy storage spring 15 in the spring chamber are compressed, thereby accumulating energy to generate power.

[0039] In this embodiment, as Figure 2 As shown, the movable seat includes a first movable seat 14a and a second movable seat 14b. The first movable seat 14a and the second movable seat 14b have the same structure and are installed in opposite directions in the cavity at a certain distance. An air cavity 132 is formed between the first movable seat 14a and the second movable seat 14b. The spring cavity 131 includes a first spring cavity 131a and a second spring cavity 131b. The first spring cavity 131a and the second spring cavity 131b are located on the front and rear sides of the air cavity 132, respectively. The first movable seat 14a and the piston 16 form the first spring cavity 131a, and the second movable seat 14b and the rear end cover 134 form the second spring cavity 131b. Spring units are respectively provided in the first spring cavity 131a and the second spring cavity 131b. When the piston 16 moves toward the first movable seat 14a, it compresses the energy storage spring 15 in the first spring cavity 131a, thereby accumulating elastic force. When the energy storage spring is compressed to a certain extent, the first movable seat 14a will be pushed, causing the gas in the air cavity 132 to be compressed, and the air pressure in the air cavity 132 will gradually increase to increase energy. When the gas in the air cavity 132 is compressed to a certain extent, the second movable seat 14b will also be pushed, thereby compressing the energy storage spring in the second spring cavity 131b, forming a second elastic force.

[0040] In this embodiment, guide rings 141 for reducing sliding resistance and sealing rings 142 for increasing sealing effect are embedded on the side walls of the first movable seat 14a and the second movable seat 14b. The outer surfaces of the guide rings 141 and the sealing rings 142 are in contact with the inner wall of the cylinder body 13. The sealing rings 142 allow the air chamber 132 to form a separate space, which effectively prevents the gas in the air chamber 132 from leaking out and affecting the nail-shooting effect. At the same time, guide rings and sealing rings are also embedded on the outer periphery of the piston 16, so that the first spring chamber 131a also forms a sealed space. That is, a piston sealing ring 163 and a guide ring 166 are set between the outer periphery of the rear mounting part 162 of the piston 16 and the inner wall of the spring chamber 131, so that the gas in the first spring chamber 131a can also be compressed and stored during the piston movement, further improving the power storage effect on the original basis. In addition, since the rear end cover 134 is installed at the rear end of the cylinder body through the rear sealing ring 1341, and a sealing ring is also provided between the second movable seat 14b and the inner wall of the cylinder, the second spring cavity 131b is also a sealed space, which has the same effect as the first spring cavity 131a mentioned above.

[0041] To better utilize the power within the spring chamber, the critical compression position of the spring unit can be made consistent with the critical compression position of the gas in the first spring chamber 131a after the piston 16 is compressed. In this way, each movement of the piston 16 can obtain the maximum power, achieving the highest cost-effectiveness.

[0042] Figure 4 This is a schematic diagram of the installation structure of the piston and the firing pin in Embodiment 1 of the present invention.

[0043] like Figure 4 As shown, the front mounting portion 161 of the piston 16 is a protruding column shape and has a slot that matches the shape of the mounting end 172 of the firing pin 17. After the mounting end 172 is inserted into the slot of the front mounting portion 161 along its moving direction, the two are fixedly connected by a radial pin 165. In this embodiment, the radial pin 165 is detachable, and when the firing pin 17 needs to be replaced, it can be quickly replaced by removing the radial pin 165.

[0044] The spring unit is freely installed in the first spring cavity 131a between the piston 16 and the movable seat 14. The spring unit has at least one energy storage spring 15. When the piston 16 is pushed backward by an external force, the spring unit on the rear side is compressed first. When the spring unit is compressed to a certain value, the first movable seat 14a will also be pushed, so that the gas in the gas cavity 132 is also compressed. When the gas cavity 132 is compressed to a certain extent, the second movable seat 14b is pushed, which also compresses the spring unit on the rear side. All three form a certain pressure to complete the energy accumulation process.

[0045] This embodiment, by compressing the piston 16, can simultaneously generate the power of compressed gas and the power of compressed spring. Compared to single-type spring nail guns or single-type gas spring nail guns under the same conditions, it can increase the power by at least several times without increasing the manufacturing difficulty of the cylinder. Furthermore, after nailing, the spring unit will continuously bounce within the cylinder 13 during the reset process. This continuous bouncing impacts the cylinder 13 or piston 16, generating continuous vibration, i.e., causing a chattering phenomenon. Since both the first and second spring chambers are sealed spaces, the bouncing of the spring unit compresses the sealed gas medium inside the first and second spring chambers, generating bouncing resistance. This can more quickly reduce the chattering phenomenon caused by the spring unit, improving the comfort of nailing. Compared to single-type spring nail guns under the same conditions, it can effectively save the user's effort.

[0046] The spring unit includes at least one inner spring 151 and an outer spring 152 that houses the at least one inner spring 151. Both the inner spring 151 and the outer spring 152 are types of energy storage springs.

[0047] In this embodiment, as Figure 2 , 3 As shown, the spring unit includes an inner spring 151 and an outer spring 152 coaxially arranged, with the outer spring 152 having a helical direction opposite to that of the inner spring 151. To facilitate the installation of the energy storage spring and prevent mutual interference, at least one spring mounting groove 164 for installing the energy storage spring is provided on the rear mounting portion 162 of the piston 16, and at least one spring mounting protrusion 143 for installing the energy storage spring extends from one side of the movable seat. The spring mounting protrusion 143 can be provided as one, with the ends of the inner spring 151 and the outer spring 152 coaxially sleeved on the outer periphery of the spring mounting protrusion 143; or two, both of which are annular, with different sizes and coaxially arranged, their outer wall diameters being slightly smaller than the inner diameters of the corresponding inner spring 151 and outer spring 152, respectively, and the ends of the inner spring 151 and outer spring 152 being installed corresponding to the inner and outer spring mounting protrusions 143. A spring mounting slot 164 is provided, the outer circle of which is slightly larger than the outer diameter of the outer spring 152, and the inner circle of which is slightly smaller than the inner diameter of the inner spring 151. This facilitates both the positioning and guidance of the energy storage spring and its separation.

[0048] The spring unit in this embodiment also has the following advantages:

[0049] 1. Without increasing the size of the cylinder 13, increase the overall elastic coefficient of the spring unit to obtain the largest possible elastic force, so as to generate greater nail-shooting power.

[0050] 2. The ratio of the maximum load force of the outer spring 152 to the maximum load force of the inner spring 151 is 5:2.

[0051] 3. To ensure the concentricity of the combined springs, the inner spring 151 and the outer spring 152 have opposite helical directions. This prevents the inner and outer springs from becoming misaligned or interfering with each other during compression or extension.

[0052] 4. Due to the different directions of spring rotation and loads, the resulting jumping frequencies are not the same, and the forces exerted on the nail gun can partially cancel each other out, thereby greatly reducing the vibration phenomenon after the work is done and improving the comfort after nailing.

[0053] like Figures 1-3 As shown, a drive platform 1331 is integrally formed on one side of the front cover 133. A drive mechanism 20 is provided on the drive platform 1331. The drive mechanism 20 includes a drive tooth 173 provided on one side of the striker 17, a notched gear 21 mounted on the drive platform 1331, a reducer 22, and a drive motor 23.

[0054] The output end of the drive motor 23 is connected to the input end of the reducer 22. The output end of the reducer 22 is equipped with a notched gear 21. The notched gear 21 has a toothed portion 211 that meshes with the drive tooth 173 and a notched portion 212 that does not mesh with the drive tooth 173.

[0055] For ease of installation, the working surfaces of the drive platform 1331 and the front cover 133 are perpendicular to each other. The drive motor 23 is mounted on the lower end face of the drive platform 1331 via a reducer 22, and the notched gear 21 is mounted on the upper end face of the drive platform 1331. A cam and a limit switch are also provided above the notched gear 21, and the cam rotates synchronously with the notched gear 21. When the cam's convex part touches the limit switch, the limit switch controls the drive motor 23 to stop rotating. A lithium battery module supplies power to the drive motor 23, and a nail gun switch is used to control the operation of the drive motor 23.

[0056] The drive teeth 173 are located on the side of the firing pin 17 near the notched gear 21 and mesh with the teeth 211 of the notched gear 21. The length of all drive teeth 173 is adapted to the compression length of the spring unit, and the number of teeth in the teeth 211 is adapted to the number of teeth in all drive teeth 173. In this embodiment, the teeth 211 occupy approximately 3 / 4 of the circumference of the notched gear, and the notch 212 occupies approximately 1 / 4 of the circumference of the notched gear. At this point, when the notched gear 21 rotates 270°, the movement of the firing pin 17 must satisfy the compression of the spring unit to the nail firing position.

[0057] When the tooth 211 engages with the drive tooth 173, the rotation of the notched gear 21 can drive the firing pin 17 to move; when the notched part 212 faces the firing pin 17, that is, when the tooth 211 does not engage with the drive tooth 173, the firing pin 17 is in a state without the constraint of the notched gear 21, and nail shooting can be realized.

[0058] <Example 2>

[0059] Figure 5 This is a schematic diagram of the piston mounting structure in Embodiment 2 of the present invention.

[0060] This embodiment provides a nail gun, which is basically the same as Embodiment 1 above, except that: Figure 5 As shown, a gap 1311 is provided between the outer periphery of the piston 16 and the inner wall of the first spring cavity 131a. When the piston 16 is pushed and leaves the buffer pad 18, the gap 1311 will connect with the through hole 181 of the buffer pad 18 and the opening of the front end cover 133, thus connecting with the outside. When the nail is fired, the piston 16 moves quickly, and the air in the first spring cavity 131a can be quickly discharged, thus not increasing the nail firing resistance to the piston 16 and the firing pin 17.

[0061] <Example 3>

[0062] Figure 6 This is a cross-sectional view of the second spring cavity in Embodiment 3 of the present invention.

[0063] This embodiment provides a nail gun, which, based on the above embodiment 1 or 2, adds the following structure: (e.g.) Figure 6 As shown, a vent hole 1343 is provided in the middle of the rear cover 134, so that the second spring cavity 131b is connected to the outside. When reset, the second movable seat 14b moves quickly, and the air in the second spring cavity 131b can be quickly discharged to reduce resistance.

[0064] <Example 4>

[0065] Figure 7 This is a schematic diagram of the air valve installation structure in Embodiment 4 of the present invention.

[0066] This embodiment provides a nail gun, which, based on the above embodiment 1, adds an air valve 19 to the rear end cover 134 for replenishing air into the second spring cavity 131b. For example... Figure 7As shown, the rear end cover 134 of the cylinder block 13 is provided with an air supply channel 1342. The air supply channel 1342 has an air inlet end (i.e., a vent 1343) that connects to the outside and an air outlet end that connects to the air chamber 132. An air valve 19 is provided in the air supply channel 1342. The air valve 19 has a one-way valve core 191, a one-way spring 192, a spring seat 193, and a one-way sealing ring 194. The one-way valve core 191 is movably disposed in the air supply channel 1342 via the one-way spring 192. One-way sealing ring 194 is provided at one end of the one-way valve core 191 and the air inlet end of the air supply channel 1342, and the other end is inserted into the one-way spring 192. The one-way spring 192 is installed at the air outlet end of the air supply channel 1342 via the spring seat 193. The one-way spring 192 presses the one-way valve core 191 against the one-way sealing ring 194 to seal the air inlet end (vent hole 1343).

[0067] In the scheme of Embodiment 1, due to wear and tear of the seals after long-term use, there will be a certain degree of gas leakage in the second spring cavity 131b. After gas leakage, when the piston 16 is in the release position after firing the nail, a negative pressure will be generated in the second spring cavity 131b, affecting the power of the firing pin 17 and the power of the next compressed air. In addition, the more gas leakage, the greater the negative pressure effect, and the greater the impact on the nail firing power. Therefore, this embodiment is equipped with the aforementioned air valve 19. When the piston 16 moves backward and compresses air, the air valve 19 is closed. When the firing pin 17 fires the nail, the vibration it generates is sufficient to cause the one-way valve core 191 to jump, which can instantly open the air valve 19 to replenish air, making the air pressure inside the second spring cavity 131b consistent with atmospheric pressure, realizing automatic air replenishment and reducing the impact of air leakage on the power storage mechanism.

[0068] Additionally, if increased power is required, the user can pressurize the second spring chamber 131b directly through the air valve 19 and external pressurization device when the piston 16 is in the released position. A preset gas pressure of 0-0.8 MPa is generally possible, resulting in greater power when the piston 16 is compressed. Furthermore, a higher pre-pressure in the air chamber 132 increases the resistance generated when the spring unit continuously bounces after nail firing, further reducing the vibration of the nail gun.

[0069] In this embodiment, the rear cover 134 is provided with two spring sleeve protrusions 1344, such as... Figure 7 As shown, both spring fitting protrusions 1344 are annular, of different sizes, and coaxially arranged. Their outer wall diameters are slightly smaller than the inner diameters of the corresponding inner spring 151 and outer spring 152. The ends of the inner spring 151 and outer spring 152 are fitted onto the inner and outer spring fitting protrusions 1344 respectively. Using two spring fitting protrusions to install the inner and outer springs separately allows for better positioning and guidance of the spring unit, preventing movement during compression or reset, thus making it more stable.

[0070] <Example 5>

[0071] Figure 8 This is a schematic diagram of the spring unit in Embodiment 5 of the present invention.

[0072] Based on the above embodiments 1-4, the spring unit has the following assembly form: the spring unit includes two or more inner springs 151 with different diameters, the inner springs 151 and the outer springs 152 are coaxially assembled, and the helical directions of two adjacent inner springs 151 are opposite.

[0073] like Figure 8 As shown, the spring unit contains two inner springs 151 of different diameters and one outer spring 152. The three springs are sequentially fitted between the piston 16 and the first movable seat 14a and between the second movable seat 14b and the rear end cover 134, according to their diameters. The inner spring 151 with the smallest diameter has the same helical direction as the outer spring 152, while the inner spring 151 in the middle has the opposite helical direction to the other two.

[0074] The spring unit in this embodiment has the following advantages:

[0075] 1. Without increasing the size of the cylinder, the overall elastic coefficient of the spring unit can be further increased to provide greater nail-shooting power.

[0076] 2. By setting different spiral directions, the concentric relationship of the combined springs can be ensured, preventing the inner and outer springs from becoming misaligned or interfering with each other.

[0077] 3. Due to the differences in the direction of rotation, mass, and stiffness of the springs, the vibration frequencies of the springs after compression and release are inconsistent. This prevents the springs from resonating, and the reaction forces of the springs will partially cancel each other out, greatly reducing the vibration after the work is done, improving the vibration reduction and nailing effect, and making nailing more effortless and comfortable.

[0078] 4. When a certain spring force is obtained, this spring unit has the advantages of small size and easy installation.

[0079] <Example 6>

[0080] Figure 9 This is a schematic diagram of the spring unit in Embodiment 6 of the present invention.

[0081] Based on the above embodiments 1-4, the spring unit has the following assembly form: the spring unit contains a plurality of inner springs 151 of the same diameter, which are evenly arranged inside the outer spring 152.

[0082] like Figure 9As shown, the spring unit contains three inner springs 151 of the same diameter and one outer spring 152. The inner springs 151 are arranged in parallel and are evenly distributed circumferentially around the extended center line of the firing pin 17. The helical directions of two inner springs 151 are opposite to those of the outer spring 152, while the helical direction of the third inner spring 151 is the same as that of the outer spring 152. This embodiment makes full use of the internal space of the outer spring 152, maximizing the overall elastic coefficient of the spring unit.

[0083] The technology and effects of the above embodiments:

[0084] The nail gun and its energy storage mechanism proposed in the above embodiments include a striking component 11 and an energy storage component 12. The energy storage component 12 has two movable seats inside its cylinder 13 that divide the internal cavity of the cylinder 13 into two spring chambers and one air chamber 132. The two spring chambers are a first spring chamber 131a and a second spring chamber 131b, which can achieve double the elastic force accumulation. Furthermore, placing the air chamber 132 between the two spring chambers can absorb the reaction force of the spring unit, better protecting the overall structure. Since the spring unit is installed in the spring chamber and the gas is in the air chamber 132, during the operation of the nail gun, the spring unit in the spring chamber and the gas in the air chamber 132 can be compressed, thereby generating the pressure of the compressed gas and the elastic force of the compressed spring. These two forces can be superimposed to provide power for the nail. Compared with single-type spring nail guns or single-type gas spring nail guns under the same conditions, it can increase power without increasing the manufacturing difficulty of the cylinder. Meanwhile, separating the air chamber 132 from the spring chamber allows both to work together while avoiding mutual interference to some extent. Furthermore, it makes it convenient to perform partial repairs and replacements if wear occurs in a certain area during long-term use.

[0085] Furthermore, the first spring cavity 131a and the second spring cavity 131b can be closed. In this structure, after the nail is fired, the spring unit will continuously bounce within the cylinder 13. This continuous bouncing impacts the cylinder 13 or the piston 14, generating continuous vibration, i.e., causing a chattering phenomenon. Because the bouncing compresses the sealed gas medium inside the spring cavity 131, creating bouncing resistance, the chattering phenomenon caused by the spring unit can be reduced more quickly, improving the comfort of nail firing. Compared to a single-type spring nail gun under the same conditions, this effectively saves the user's effort. Moreover, the gas inside the spring cavity can also be compressed simultaneously during spring compression, further increasing the pressure in conjunction with the air cavity 132, providing greater power for nail firing.

[0086] This invention can also add an air replenishment unit to the second spring cavity 131b. The air replenishment unit is preferably an air valve 19, which is located on the rear end cover 134 of the cylinder body 13 and is used to replenish air to the second spring cavity 131b. When the piston 14 moves backward, compressing air, the air valve 19 is closed. When the firing pin fires the nail, the resulting vibration is sufficient to cause the one-way valve core 191 of the air valve 19 to jump, instantly opening the air valve 19 to replenish air, making the air pressure inside the second spring cavity 131b consistent with atmospheric pressure, achieving automatic air replenishment and reducing the impact of air leakage on the power storage mechanism. Furthermore, if it is necessary to increase the power of the nail gun, the user can directly pressurize the second spring cavity 131b through the air valve 19 and an external pressurizing device when the piston 14 is in the released position, thereby generating greater power when the piston is compressed. The greater the pre-pressure inside the second spring cavity 131b, the greater the resistance generated when the spring unit continuously jumps after firing the nail, which can further reduce the vibration effect of the nail gun.

[0087] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A power-accumulating mechanism for a nail gun, installed inside the nail gun, for providing power for the nail inside the nail gun to be driven out, characterized in that, include: The cylinder body is located inside the nail gun and has a spring chamber and an air chamber inside it; The movable seat is movably disposed within the cylinder body; A spring unit is movably mounted within the spring cavity and has at least one energy storage spring; The piston is movably disposed at the front end of the cylinder. as well as A firing pin, mounted on the piston, extends from the cylinder to strike the nail; The spring cavity has a first spring cavity and a second spring cavity, and the air cavity is located between the first spring cavity and the second spring cavity. The spring unit is provided in both the first spring cavity and the second spring cavity. When the piston is pushed by an external force, the gas in the air cavity and the spring unit in the spring cavity are compressed to store force.

2. The power-accumulating mechanism for a nail gun according to claim 1, characterized in that: in, A gap is provided between the outer periphery of the piston and the inner wall of the first spring cavity to connect the spring cavity with the outside.

3. The power-accumulating mechanism for a nail gun according to claim 1, characterized in that: in, A piston sealing ring is provided between the outer periphery of the piston and the inner wall of the first spring cavity to isolate the spring cavity from the outside.

4. The charging mechanism for a nail gun according to claim 2 or 3, characterized in that: in, The cylinder body is provided with a front cover and a rear cover at the front end and the rear end, respectively. A buffer pad is provided between the front cover and the piston, and a sealing ring is provided between the rear cover and the inner wall of the cylinder body. The movable seat includes a first movable seat and a second movable seat. The first movable seat and the piston form the first spring cavity, the first movable seat and the second movable seat form the air cavity, and the second movable seat and the rear end cover form the second spring cavity.

5. The charging mechanism for a nail gun according to claim 4, characterized in that: in, The first movable seat and the second movable seat are installed in opposite directions inside the cylinder.

6. The charging mechanism for a nail gun according to claim 4, characterized in that: in, The rear end cover has a through hole that connects the second spring cavity to the outside.

7. The power-accumulating mechanism for a nail gun according to claim 6, Its features are: in, An air supply channel is provided on one side of the through hole, and an air valve is installed inside the air supply channel. The air valve includes: The one-way valve core is movably disposed within the air supply channel; A one-way sealing ring is disposed between the through hole and the one-way valve core; A spring seat is disposed at the outlet end of the air supply channel; and A one-way spring, one end of which is mounted on the spring seat, and the other end which mates with the one-way valve core. The one-way spring presses the one-way valve core against the one-way sealing ring to seal the through hole.

8. The charging mechanism for a nail gun according to claim 4, characterized in that: in, The spring unit includes at least one inner spring and an outer spring that houses the at least one inner spring. A buffer pad for cushioning the piston is installed on the front side of the cylinder.

9. The power-accumulating mechanism for a nail gun according to claim 8, characterized in that: in, The spring unit includes an inner spring and an outer spring arranged coaxially, wherein the outer spring has the opposite helical direction to the inner spring; Alternatively, the spring unit may include two or more inner springs of different diameters and one outer spring, wherein the inner springs are all coaxially arranged inside the outer spring, and the helical directions of adjacent inner springs are opposite.

10. A nail gun, characterized in that, include: The power-accumulating mechanism is used to provide the power for the nail inside the nail gun to be struck and ejected. A drive mechanism is used to drive the power storage mechanism to generate the power. The power storage mechanism is the power storage mechanism for a nail gun as described in any one of claims 1-9.

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